2013 1/2 oz .999 Silver 50 Cent Australian/American Memorial War in the Pacific

2013 1/2 oz .999 Silver 50 Cent Australian/American Memorial War in the Pacific coin.
Here are my dimensions (at the bottom of the post).
My coin passed the specific gravity test, passed the weight test (15.65 grams),  passed the sound test using Ultrasonic Thickness Gauge Industrial-882X (yes, it works, or I got the true thickness measurement by accident).
The caliper test measurements were off so I searched on Google.
The coin passed the slide test using neodymium magnets (I built a slide--at ~70 I have a lot of time on my hands), and the coin is not magnetic. My coin is real, so I surmised and as the Google searches confirmed. Here are the dimensions which need changing.

Weight:         15.55-15.65 grams variation

Diameter:    32mm …not 32.6mm
Thickness:   2.3mm …not 3.1mm

Hello 🤖

Without pictures, it will be very difficult for anyone to help you. Could you please post clear pictures of each side of your item?

Please note that this is an automatic message. Feel free to ignore if it is not relevant.

Hello Blue Pig and welcome to Numista! I have a feeling you want something but it's hard to read your mind from such a large distance. If it's about a coin in the Numista catalog you should include a link to it rather than expecting everyone reading this to go searching for it.  You may also want to read this about modifying the Numista catalog:  https://en.numista.com/help/i-noticed-an-error-in-the-numista-catalogue-what-can-i-do-12.html 

Keep in mind that values are typically target values and with any modern minting process making 1 million coins there will be variations.  Also keep in mind that published thickness values are for the rim which typically is thicker than the center of the coin and can't be easily measured with UT equipment.  A coin of .999 silver is never magnetic and will always react to a magnetic slide so I'm not sure what you're requesting there.

rsirian1

Hello Blue Pig and welcome to Numista! I have a feeling you want something but it's hard to read your mind from such a large distance. If it's about a coin in the Numista catalog you should include a link to it rather than expecting everyone reading this to go searching for it.  You may also want to read this about modifying the Numista catalog:  https://en.numista.com/help/i-noticed-an-error-in-the-numista-catalogue-what-can-i-do-12.html 

 

Keep in mind that values are typically target values and with any modern minting process making 1 million coins there will be variations.  Also keep in mind that published thickness values are for the rim which typically is thicker than the center of the coin and can't be easily measured with UT equipment.  A coin of .999 silver is never magnetic and will always react to a magnetic slide so I'm not sure what you're requesting there.

Thank you, rsirian1 
I'm saying my coin is real and that the diameter posted on the coin as linked below is off by 0.6mm (at least in my case).
Here is the link: N#73868
I went to the page and requested a change of dimensions as you stated in your post. Thank you for that information!
There is a big difference (at least to me) between a diameter of 32.6mm and one of 32mm and a thickness of 3.1mm and 2.3mm. The 2.3mm is at the edge (measured by my calipers).
I see that rather than a change of dimensions, perhaps a range of dimensions is best.

I thank you for making me change my initial (and this) post to be more readable, and for the information you have given me. 
I see there can be variations which are real (apparently) and can be confusing to people new to this. I am new to this myself (hence my confusion).

I'm sorry. I missed the part where somebody said you coin wasn't real. Was that in a different post?  

rsirian1

I'm sorry. I missed the part where somebody said you coin wasn't real. Was that in a different post?  

It's possible. My coin is real. I edited many things in my original post.
I obtained the coin from mbarrcoins on eBay. They are a reputable dealer who have sold over 3 million coins with a 99.9% feedback. The negatives were about shipping and receiving coins in a different state than the pictured one (and they ignored the notice that said stock photo). I saw no negative or neutral posts about fakes.
In any case, I did the measurements I specified in my original post.

I asked for a change of dimensions at the coin page: N#73868

I see that rather than a change of dimensions, perhaps a range of dimensions is best.

I thought my coin was not real, although it passed the slide test, and the specific gravity test (10.49xxx), because the dimensions were off.
I searched many sites with pages regarding this coin and one had the dimensions which I measured, and I was relieved.

Some sites had one of the measurements correct, but were off on the other. Those were mixed, as I recall. I can try to find these sites again and post them here if you wish (given that I have time for this).
I wish to relieve other people who may be confused about the differing measurements.

No need. I'm sure the referee of the Australian coin catalog (@brismike )will change the dimensions if they are wrong.  Nobody is suggesting what you measured were not on the same coin. 

rsirian1

No need. I'm sure the referee of the Australian coin catalog (@brismike )will change the dimensions if they are wrong.  Nobody is suggesting what you measured were not on the same coin. 

Thank you. I just want other people to see that, apparently, dimensions can be way off (as I see it).
I wish other people to know that there are differing measurements regarding diameter and thickness on different pages (using a search engine).

Can you please provide the links where you have found that this coin has a diameter of 36mm? I have checked in my Australian coin catalogue (by Greg McDonald 17th edition) and the diameter for this coin is actually stated as 32.6mm.

 So the 36.6mm that we have on Numista is definitely wrong. I suspect it was meant to be entered as 32.6mm but a typo has caused the error.

If you peruse all of the Perth Mint Silver 50 cent ½ ounce coins on Numista you will find that they are either 32.6mm or 36.6mm. It looks like all the Lunar editions are 36.6mm up to 2018, and all the rest are 32.6mm.

So at this stage I will adjust the size of the coin to be 32.6mm. If you can provide proof that your coin is 36mm we can reconsider. A photo of it in your calipers showing the measurement or links as mentioned above.

Regards Mike

brismike

Can you please provide the links where you have found that this coin has a diameter of 36mm? I have checked in my Australian coin catalogue (by Greg McDonald 17th edition) and the diameter for this coin is actually stated as 32.6mm.

 

 So the 36.6mm that we have on Numista is definitely wrong. I suspect it was meant to be entered as 32.6mm but a typo has caused the error.

 

If you peruse all of the Perth Mint Silver 50 cent ½ ounce coins on Numista you will find that they are either 32.6mm or 36.6mm. It looks like all the Lunar editions are 36.6mm up to 2018, and all the rest are 32.6mm.

 

So at this stage I will adjust the size of the coin to be 32.6mm. If you can provide proof that your coin is 36mm we can reconsider. A photo of it in your calipers showing the measurement or links as mentioned above.

 

Regards Mike

I will search. Going to sleep right now though. Will search when I get up.

…edit 5:52 pm, I'm on it. Searching. By the way, the diameter of my coin is 32.00 mm to 32.02 mm as I turn it in the calipers. I suspect my coin is wearing down from the measurements, but I bought it for that purpose.

I must have seen 36.6mm on your site and unconsciously accepted it, except for the decimal part. Again, my coin is 32.01mm - 32.02mm in diameter. Looking for those links now.

AI Overview

The 2013 1/2 oz .999 Silver 50 Cent Australian/American Memorial War in the Pacific coin has a diameter of 32.6 mm and a thickness of 3.10 mm.

Above from Google AI.

https://silvergoldbull.com/1-2-oz-u-s-australian-wwii-silver-coin
above link  under specifications it says coin is 32.6mm in diameter with an Average Thickness (as they say) of 2mm.

https://agroundworld.com/pshop/australia-miscellaneous-silver-coins/2013-halfoz-australia-war-in-the-pacific-silver-bullion-coin-264.html

above link says specs 32.6mm diameter and 3.1 mm thickness.

https://onlinecoin.club/Coins/Country/Australia/Silver_Half_Ounce_2013_War_in_the_Pacific/

The above link gives the diameter as 32.6mm but concurs with my thickness reading of approximately 2mm thickness.

My thickness measurements vary from 2.39mm, 2.34mm, 2.32 mm, 2.28mm, 2.37, 2.29mm, 2.33mm, 2.30mm, as I measure different spots on the coin edge(s) with my calipers. 2.14mm, this measurement was made when I positioned the coin in the calipers to exclude the edges.
It stays about the same (2.15mm, 2.12mm as I turn the coin in the calipers excluding the edges. It likely fluctuates due to the coin features. 
 

I suspect the edge is higher and lower in places. Perhaps my coin is fake. But the specific gravity was 10.49xxx. And the weight was 15.65 grams. And it was non magnetic and went slowly down the neodymium slide I made.

https://coinscatalog.net/australia/coin-1-2-oz-silver-50-cents-australian-american-wwii-memorial-km-2073-silver-bullion-coins

The above site gives the diameter incorrectly as 36.6mm. The thickness is listed as 2.3mm (much like mine in places).

https://aubullion.ca/shop/silver/silver-tubes/2013-australia-1-2-oz-silver-war-in-the-pacific-coin-tube-25-coins-perth-mint/?srsltid=AfmBOoodNVV445E2oY3_geOKHUB9dYdDNgfbyGfsfZiAEcUSRMCJc71h

Above link, out of stock but scroll down a bit and under Description and then Coin Specifications, diameter 32.6, thickness 2.3mm.

https://www.jmbullion.com/1-2-oz-us-australian-wwii-silver-coin-bu/

above under specifications, 32.6mm diameter and 2mm thickness.

That's all there is under the search term “2013 1/2 oz .999 Silver 50 Cent Australian/American Memorial War in the Pacific dimensions”

Would you say that a coin whose diameter is 32.6mm by all wisdom can have a copy which tests fine in many areas, but has a diameter of 32mm?
I'll have to take my coin to a coin shop to see if it's real. I'll post the results in this thread.

So after all that your coin is not 36mm but is actually 32.2 mm. 🙄

I suspect your calipers might be slightly out so I will keep the coin listed at 32.6 as per just about every other Perth Mint ½ ounce 50 cent silver coin listed on Numista.

I believe your coin is not fake. It is a real coin and you don't need to stress about the diameter being a couple of mm different in the grand scheme of things.

Regards Mike

brismike

So after all that your coin is not 36mm but is actually 32.2 mm. 🙄

 

I suspect your calipers might be slightly out so I will keep the coin listed at 32.6 as per just about every other Perth Mint ½ ounce 50 cent silver coin listed on Numista.

 

I believe your coin is not fake. It is a real coin and you don't need to stress about the diameter being a couple of mm different in the grand scheme of things.

 

Regards Mike

My coin is actually 32.01mm - 32.02mm in diameter, but I guess that's within the tolerance. I'll still take it to a dealer since I want to see if mbarrcoins on eBay sends fakes (I doubt they do--so many sold…millions). I wish to bid on more of their stuff so I must do my due diligence :)
Many thanks to you, brismike